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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d22587c4015f13c562edcb493513d500479eed38f5df4bf3185226f493e2112' 
  AND token = '4WHzXD8K2rz57JiW1VMaLCWOQpXVhzzAY30ish5Q0NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}